Show your work and write a short explanation with each calculation. Part I: Calculate the energy change (q) of the surroundings (water) using the enthalpy equation qwater = m × c × ΔT. We can assume that the specific heat capacity of water is 4.18 J / (g × °C) and the density of water is 1.00 g/mL. The water has absorbed the heat of the metal. So, qwater = qmetal Using the formula qmetal = m × c × ΔT, calculate the specific heat of the metal.
Calorimetry is the most convenient way to measure the heat of combustion. It studies the heat transfer from a hotter object to a colder one. In a calorimeter, the combustion reaction occurs in a closed container under constant volume. A compound, usually a hydrocarbon, is burned in the presence of excess oxygen forming carbon dioxide and water as products. Important thermodynamic information, such as the enthalpy of combustion, could be obtained by measuring the temperature change.
The acids are determined on how much H they have and bases are determined on how much they mess with the hydrogen concentration. When looking at the acid and base used in this lab HCl is an acid and NaOH is a base. To determine a pH value the molarity of the acids and bases must be below one, so using .1 M NaOH and HCl is ideal. To measure the pH the mathematical equation is used: pH = -log [H+] and pOH = -log [OH-]. When adding these up the end result has to be 14 because acids go from 1-7 and basic from 14-7.
Name: 6.03: Calorimetry Data and Observations: Part I: Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of part I. (4 points) I observed that when the metal is placed inside the calorimeter, it transfers heat to the water making the water increase temperature while the metal will decrease temperature. I also noticed that the system was the metal and the surroundings is the water, this is because the water is taking in the heat from the metal making the water warm. Metal Name Mass of Metal Volume of water Initial temp.
Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining |Table 1: pH of Water Samples | |Water Sample |Initial pH |Final pH (24-48 hours) | |Pyrite |6 |4 | |Activated Carbon |6 |7 | |Water |6 |6 | POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = If pyrite is introduced to the water, then it will be more acidic. b. Coal hypothesis = If coal is introduced to the water, then the ph level will stay the same.
Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining |Table 1: pH of Water Samples | |Water Sample |Initial pH |Final pH (after 48 hours) | |Pyrite |.6pH |.7pH | |Activated Carbon |.6pH |.8pH | |Water |.6pH |.7pH | POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal (activated carbon) on the acidity of water? a. Pyrite hypothesis = If pyrite is added to water, then the acidity of the water is neutral. b. Coal (activated carbon) hypothesis = If coal or activated carbon is added to water then the acidity of water is basic.
default value as 0 to uninitialized variables 3. Write assignment statements that perform the following operations with variables a, b and c. set b = a+2 set a = b*4 set b = a/3.14 set a= b-8 4. Write assignment statements that perform the following operations with the variables a, b, and c. a. Adds 2 to a and stores the result in b b. Multiplies b times 4 and stores the result in a c. Divides a by 3.14 and stores the result in b d. Subtracts 8 from b and stores the result in at a. Set result = x + y = 4+8= 12 b.
On the other hand, miscible mixtures are subject to simple and fractional distillations, while ideal mixtures follow Raoult’s law. This law dictates that the total vapor pressure of the system is equal to the addition of the products and the respective mole fractions of each compound. Volatile compounds, which are unstable or have high boiling points, benefit from steam distillation because
This method is used because it has two certain advantages, according to Nerdz-Stormes. First, the percentage of quantity of the yield is much higher with this method than if it is just manually pressed. Second, it’s aimed to get a lower boiling point of the liquid by mixing the compound with water. The theory of this distillation process is mixing compounds that contain the aimed product with water to reduce the boiling point of it, so the organic compound does not decomposed by heat. The boiling point can be reduced because of the vapour pressure of it would be the sum of water’s vapour pressure and the compound’s vapour pressure.
*Note: The volume of gas generated in the actual lab will contain water vapor in addition to hydrogen gas. In addition, there will be a vacuum that is created by the downward pressure due to the difference in water level in the graduated cylinder and in the water basin. This will cause a negligible increase in the volume compared to